| 摘要 |
<p>PURPOSE:To improve the operability and safety in the lifting work of a rood unit as well as to enable even the heavyweight one to be surely lifted and set up there. CONSTITUTION:A structural material for each roof surface of two roof units 2 and 3 is composed of those of channel steel 14 with two orthogonal surfaces and square steel pipes 15, 24, and two nuts 18, 27 tightly attachable with an eyebolt 31 are welded and locked to each top and side of the channel steel 14 and the square steel pipes 15, 24. Since these nuts 18, 27 are locked each to two surfaces of the channel steel 14 and the square steel pipes 15, 24, supporting strength is well improved, so that even the heavyweight roof unit is liftable with certainty.</p> |
